Closure for sheet-metal receptacles



, Aug. 13, 1929. Q RlEGEL I 1,724,366

CLOSURE FORSHEET METAL REGEPTAGLES I Filed April `2o 1923 ATTO RN EYSPatented Aug. 13, 1929.

TENT "OFFICE,

CLARENCE E. RIEGEL, F NILES, QHIO.

cLosuBE Fon 'SHEET-METAL nncnrrnoiaiis.

Application filed Api-il 20, 1923.

The present invention is an improvement in that class of sheet-metalreceptacles in which an annular bushing or collar iswelded to a.relatively thin Wall of the receptacle to provide an increased thicknessof met-al for the reception or attachment of a closure cap, bung, orscrew-plug, and in which hermetical sealing is effected by using agasket of rubber or other compressible material at the joint. Ingeneral, my object is`to`provide a bushing or collar of special designand construction which may be electrically welded to a. thin sheet-metalwall .Without distorting the seat for the sealing gasket, and morespecifically, to provide a bushing orcollar having a Welding Hange ofreduced thickness surrounding its central sealing and engaging portionwhich will permit a welded union to be made contiguous t0, but apartfrom a raised seat for the sealing gasket. A further object is toprovide a stepped recess within the wall and to weld a stepped annulustherein substantially flush with the plane surface of said wallinteriorly of the receptacle, and to notch the relatively thickercentral body portion of the annulus to promote fullv and completedrainage of thereceptacle when the bung or plug is removed and thereceptacle tilted or inverted. l y v In the annexed drawing, Fig. 1 y.isa sectional view of a portion of the head of a. lsheet-metal drum caski" barrel and a screwcollar welded thereto, and with a screwplug enteredand secured within the collar.

Fig. 2 is a side elevation of the bung or' screw-plug, and showing aring gasket in section thereon. Fig. 3 is a sectional view of thescrew-threaded collar` welded-to a sheet metal Wall, and without the'screw-plug. Fig. 4 is a bottom view of the collar'and fragment of wallshown in Fig. 3. Fig. 5 is a sectional .view of a fragmentary piece of'sheet-metal having an opening and "Y stepped recess as made to receivethe screw-l threaded collar. Fig. 6 is a perspective view of thescrew-threaded collar as it appears before it: is introduced into thestepped re cess and welded to the Wall.

The closure device hereinafter described.

5 welding methods and. machines. l prefer to Serial No. 633,451.

use electric pressure welding methods but do not Wish to limit myself tosuch particular methods of welding as other welding steps or methods maypossibly be used advantageously, following the teachings'of the presentdisclosures. Thus, the invention involves the forming of a round opening2 of a predetermined diameter in the sheet-metal wall 3 of a receptacle,such as a drum, cask or b arrel adapted to hold and store a fluid orliquid ot any kind, or in a receptacle where it is desired to have afluid tight or hermetically sealed filling opening or dispensing outlet.lAs shown, the closure device is applied to tlieliead of a cask orbarrel B, but

it may be incorporated instead within the side lwall or body of thebarrel. In either case the sheet-metal is pressed oi' stamped outwardlyiii stepped fashion to provide a raised flat roundtapering boss orvpiotuberance 4 surrounding the opening 2 and also ashghtly raisedannular offset- 5 of larger diameter at the base of said-boss orprotuberance 4', thereby also producing a round end rela-tively deepflaring recess or cavity 6 within the boss a adjacent vopening 2 and asecond shallow` recess or cavity 7 of larger diameter within the annularoffset 5 remote from opening 2 and the flat top of boss 4. I

top ledge or stepped surface 9 to provide an u annular centering rib 12adapted tofenter and it the round opening 2 in wall 3. The lower orinner end of the main body of collar 8 is reduced in diameter andextends downwardly in the form of a ange 14: beneath the dat bottom ofthe relatively thin laterally-extending base ilange 15 which providesthe irst stepped surface 10. 'When iange 15 is seated fully within theshallow recess 7`the bottom face of the liange is substantially flushwith the inner face 16 of wall'3, and therefore'in order that all theliquid in the cask or barrel vmay be emptied or drained freely therefromI form slots,

gaps or open spaces 17 within the round depending extension or liange'14.

' wall 3 the pointed projections 18 engage the inner orbottom facev ofthe base offset 5, and

whenpressure and an electric welding current is applied to these partsby means of suitable electrodes the plate 3 and the` projectiors. v18are welded or. homogeneously united together, and welding a't all thepoints involved occurs simultaneously with the welding machines used inactual practice. Inasmuch as the heating and welding of plate 3 islocalized at spaced intervals in the base offset 5 and the thin baseliange 15 at points remote from the raised step 9 and the top of boss 4,no distortion or malformation of the metal occurs at suchelevatcdplaces, thereby leaving a perfectlylv liatplane top surface for sealinggasket 20 to seat upon.v

A screw plug 11 having a lateral iiange 21 is customarily employed withgasket 20 to effect a fluid-tight joint, and if desired the bottom faceof flange 21 may be channeled,

beveled or undercut at 22 opposite the centering rib 12 on collar 8 tolocalize the colnpression upon the gasket opposite the top surface 4 ofwall 3. This latter feature, and the forming of a hermetical seal bycompressing a gasket between a flanged cap orscrew plug and the top orouter surface of the wall or body of a thin sheet metal container orreceptacle re-enforced by a= collar upon the inside of the container isnot ble stepped reenforcing ring fitted within` said stepped portionsand welded at' luniformly'spaced intervals to the outer concentricportion with its face iush with the inner surface of said wall, and aclosure member in coupling connection with said ring having a sealingportion overlapping the inner concentric portion.

2. A, receptacle having a sheet-metal wall formed with concentric bossesand an opening, a re-enforcing ring'having a lateral flange seatedwholly within said bosses Hush with the inner side of said wall andprovided with a screw-threaded extension at its bot# tom having lateraldrainag' openings extending to the edge thereof, and a closure memberconnected to said ring.

In testimony whereof I alix my signature hereto.

CLARENCE H. RIEGEL.

